I just started DIYing. I made a pretty big order with a ton of flavors. All concentrates are TPA/TFA, however I may have made a mistake by not ordering any sweetner. I made a tobacco\vanilla mix and a menthol\mint mix that came out pretty well. I just mixed up my first fruity flavor, and at 15% flavoring, it just seems lacking. What have you guys found, using TPA/TFA as far as sweetner? Are they sweet enough on their own, and I just have to find the right %, or do you find that most of TPA/TFA flavors also need some sweetner added?